Bump ruby/setup-ruby from 1.202.0 to 1.203.0 (#537)

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.202.0
to 1.203.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/ruby/setup-ruby/releases">ruby/setup-ruby's
releases</a>.</em></p>
<blockquote>
<h2>v1.203.0</h2>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/ruby/setup-ruby/compare/v1.202.0...v1.203.0">https://github.com/ruby/setup-ruby/compare/v1.202.0...v1.203.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ruby/setup-ruby/commit/2a18b06812b0e15bb916e1df298d3e740422c47e"><code>2a18b06</code></a>
Require macos-13+ for macos-amd64 as builds from now on will be on 13
and 12 ...</li>
<li><a
href="https://github.com/ruby/setup-ruby/commit/2e3487c00ef7a9b36871f6c915e07bc6dc783494"><code>2e3487c</code></a>
No more macos-12 runners, minimum for macos-amd64 is now macos-13</li>
<li><a
href="https://github.com/ruby/setup-ruby/commit/6825c765eb33355054208d865dd846da7da6584f"><code>6825c76</code></a>
Clarify</li>
<li><a
href="https://github.com/ruby/setup-ruby/commit/9a9fe58c47b8bca3b707c7a46d0c67c4a3fe6d89"><code>9a9fe58</code></a>
Clarify all macOS versions from 12 are supported</li>
<li>See full diff in <a
href="https://github.com/ruby/setup-ruby/compare/a2bbe5b1b236842c1cb7dd11e8e3b51e0a616acc...2a18b06812b0e15bb916e1df298d3e740422c47e">compare
view</a></li>
</ul>
</details>
<br />


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.github/workflows/build.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Set up Ruby ${{ matrix.ruby }}
-      uses: ruby/setup-ruby@a2bbe5b1b236842c1cb7dd11e8e3b51e0a616acc #v1.190.0 tag
+      uses: ruby/setup-ruby@2a18b06812b0e15bb916e1df298d3e740422c47e #v1.190.0 tag
       with:
         ruby-version: ${{ matrix.ruby }}
         bundler-cache: true